The most sticky glue, and a method of distribution to cover a massive area in it, requires the Superior Adhesive Factory.
~ Official BMC description

The Superior Adhesive Factory allows research of the Glue Striker upgrade for purchase for the Glue Gunner. It costs $16,000 to build, takes 36 hours to construct, and gives 500 XP when built, and requires the Sticky Sap Plant tile to construct. It consumes Lightning thing-040 and a 1x1 tile space. It requires Level 20 to unlock.

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